Bang Day is the day that
you first have sex
with the partner of your new relationship. Bang
Day does not refer to one-night stands - it is relationship dependent. If your relationship lasts
longer than one year, Bang
Day then becomes
known as your Bangiversary - the anniversary of the day you first
with your partner.
"Hey man, how long
you been seeing Sarah?"
"Two months - yesterday was our Bang Day."
"Nice, congratulations dude."